4000 Litre Rainwater Harvesting System with Pump, Filter & Slimline Wall Tanks
Supplied as a complete system with five 800 litre slimline wall tanks, this modular setup delivers substantial rainwater storage while maintaining a compact footprint suitable for restricted installation areas.
Ideal for non-potable water applications, including:
- Garden irrigation and landscape watering
- Car washing and vehicle maintenance
- Window and exterior cleaning
- Driveway and patio pressure washing
- Toilet flushing systems
- General sustainable water reuse
This system is widely specified where large-scale rainwater harvesting is required without the need for underground installation.
Key Features
- Extra-large 4000 litre rainwater harvesting system
- Five slimline 800 litre wall tanks
- Fully modular expandable design
- Professional automatic garden pump included
- Advanced rainwater filtration system
- Compact footprint despite high capacity
- Suitable for domestic and commercial use
- UV resistant polyethylene construction
- Designed for non-potable water applications
- High-performance serviceable pump system
- Ideal for large-scale sustainable water storage
Slimline 800L Wall Tank System Design
Each upright wall tank has a compact footprint of just 800mm x 600mm, making it suitable for installation in tight or difficult-access locations.
The slimline vertical design allows installation:
- Along exterior walls and boundaries
- Beside garages, sheds, and outbuildings
- In side passages and narrow spaces
- Inside basements and plant rooms
- Through standard doorways and staircases
When installed against a wall, adequate clearance must be maintained to allow for natural tank expansion when filled.
Fully Modular & Expandable Rainwater Storage System
The system is designed for flexibility and scalability, allowing additional tanks to be added at any time using integrated 3/4” BSP threaded connection ports and included tank-to-tank connector kits.
This modular approach enables the system to grow alongside increasing water demand, making it suitable for both residential and commercial installations.
Professional Automatic Garden Steel Pump
The system includes a high-performance XAJE80P intelligent automatic pump, engineered for reliable delivery of harvested rainwater for garden and domestic use.
Pump Features:
- Automatic pressure-controlled operation
- 4 bar maximum pressure output
- Flow rate up to 50 litres per minute
- 0.8hp stainless steel motor
- Fully waterproof IP68 rated construction
- Self-priming capability
- Dry run protection with automatic restart
- Anti-blocking system for reliability
- Serviceable design with replaceable components
- Non-return valve included
- Multi-hose reducer (1”, 3/4”, 1/2” compatibility)
- Integrated carry handle
This professional pump system is designed for long-term reliability and easy maintenance.
High-Efficiency 3P Rainwater Filter & Diverter
The included Black 3P Filter Collector provides advanced rainwater filtration and downpipe diversion in a single unit.
Key Features:
- Compatible with UK round downpipes (68mm–110mm)
- Compatible with square downpipes (65mm–75mm)
- Suitable for roof areas up to 90m²
- Stainless steel fine mesh filtration system
- Prevents leaves and debris entering tanks
- Automatic overflow return to drain
- UV and frost-resistant housing
- Designed for long-term outdoor durability
- Available in Black, Grey, and Brown finishes
This system ensures clean, filtered rainwater is delivered directly into the storage tanks.
Durable UV-Stabilised Polyethylene Tanks
Each tank is manufactured from 9mm thick UV-stabilised polyethylene, designed for strength, durability, and long-term outdoor performance.
Tank Features:
- Rotationally moulded seamless construction
- UV resistant and weatherproof
- Food-grade polyethylene material
- Three inset 3/4” brass threaded ports
- Anti-glug tap included
- Designed for heavy-duty long-term use
Available Tank Colours:
- Black
- Granite
- Sand
Note: Colours may vary slightly due to lighting and screen settings.
Included Components
- 5 x 800L Upright Wall Tanks
- Anti-Glug Taps
- Wall Fixing Brackets
- Multi Holesaw Kit
- Rubber Grommets
- XAJE80P Automatic Garden Steel Pump
- Non-Return Valve (NRV)
- Carry Handle
- Multi-Hose Reducer
- Pump-to-Tank Connector with Ball Valve
- 4 x Tank-to-Tank Connector Kits (25cm)
- 3P Filter Collector Rainwater Diverter
- Tank Water Level Gauge
System Specifications
Ideal Applications
- Large residential rainwater harvesting systems
- Commercial water storage solutions
- Landscape and garden irrigation
- Agricultural water reuse
- Sustainable building projects
- Vehicle washing and maintenance
- Toilet flushing systems
- Eco-friendly water management
- Estate and property maintenance
- High-demand water supply systems
Why Choose the 4000L Rainwater Harvesting System?
The 4000 litre system is the largest configuration in this range, designed for users requiring maximum rainwater storage capacity while maintaining a space-efficient installation footprint.
With five modular slimline tanks, intelligent automatic pumping, professional-grade filtration, and long-term expandability, this system provides a robust and scalable solution for serious rainwater harvesting applications.
It is ideal for homeowners, commercial properties, and installers needing a reliable high-volume above-ground water storage system.
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